//
// DSAKeyValue.cs - DSA KeyValue implementation for XML Signature
//
// Author:
//	Sebastien Pouliot (spouliot@motus.com)
//
// (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Security.Cryptography;
using System.Text;
using System.Xml;

namespace System.Security.Cryptography.Xml {

	public class DSAKeyValue : KeyInfoClause {

		private DSA dsa;

		public DSAKeyValue () 
		{
			dsa = (DSA)DSA.Create ();
		}

		public DSAKeyValue (DSA key) 
		{
			dsa = key;
		}

		public DSA Key 
		{
			get { return dsa; }
			set { dsa = value; }
		}

		public override XmlElement GetXml () 
		{
			XmlDocument document = new XmlDocument ();
			XmlElement xel = document.CreateElement (XmlSignature.ElementNames.KeyValue, XmlSignature.NamespaceURI);
			xel.SetAttribute ("xmlns", XmlSignature.NamespaceURI);
			xel.InnerXml = dsa.ToXmlString (false);
			return xel;
		}

		public override void LoadXml (XmlElement value) 
		{
			if (value == null)
				throw new ArgumentNullException ();

			if ((value.LocalName != XmlSignature.ElementNames.KeyValue) || (value.NamespaceURI != XmlSignature.NamespaceURI))
				throw new CryptographicException ("value");

			dsa.FromXmlString (value.InnerXml);
		}
	}
}
